[[Documentation]]
*Examples
**List Concatenation
append(c(1,c(2,c(3,n))),c(4,c(5,n)),result).
append(X,Y,Z), n(X) :- Y=Z.
append(X,Y,Z), c(A,X1,X) :- c(A,Z1,Z), append(X1,Y,Z1).
RESULT: result(c(1,c(2,c(3,c(4,c(5,n)))))) with the two rules above.
The first line of the above example is written using the ''term abbreviation scheme'' explained in the [[Syntax]] page. By making more use of the
term abbreviation scheme and the Prolog-like list syntax, list concatenation
can be written also as:
result = append([1,2,3],[4,5]).
Z=append([], Y) :- Z=Y.
Z=append([A|X1],Y) :- Z=[A|append(X1,Y)].
RESULT: result=[1,2,3,4,5] with the two rules above.
**Self-Organizing Loops
a(free,free),a(free,free),a(free,free),a(free,free),a(free,free),
a(free,free),a(free,free),a(free,free),a(free,free),a(free,free),
a(free,free),a(free,free),a(free,free),a(free,free),a(free,free),
a(free,free),a(free,free),a(free,free),a(free,free),a(free,free),
a(free,free),a(free,free),a(free,free),a(free,free).
a(X,free),a(free,Y) :- a(X,C),a(C,Y).
RESULT: Many possible results. You can obtain them by running the program using the ''-s'' option.
**Vending Machine
{customer,a,five,one,one,hunger,hunger}. % Customer a has $7, buying 2 chocos
{customer,b,five,hunger}. % Customer b has $5, buying 1 choco
{vending,choco,choco,choco,one,one}. % Vending machine has 3 chocos
{customer,$c,hunger,five}, {vending,$v,choco,one,one}
:- {customer,$c,choco,one,one},{vending,$v,five}.
{customer,$c,hunger,one,one,one},{vending,$v,choco}
:- {customer,$c,choco}, {vending,$v,one,one,one}.
Two customers with different amounts of coins and hunger
are buying some chocolates from a vending machine.
Each chocolate costs three
and only two kinds of coins are considered: one and five.
Run this program several times in shuffle mode (type shuffle)
to observe its non-deterministic behavior.
RESULT 1:
{customer,a,choco,choco,one},
{customer,b,choco,one,one},
{vending,five,five,one}, <RULES>
RESULT 2:
{customer,a,hunger,hunger,five,one,one},
{customer,b,choco,one,one},
{vending,choco,choco,five}, <RULES>
Observe that applying each rule preserves
the total amount of coins and chocos within this system.